package com.bito.aiot.admin.controller.websocket;

import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import javax.websocket.*;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;
import java.io.IOException;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.CopyOnWriteArraySet;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * @author 小木
 * @date 2022/9/22
 */
@Data
@Slf4j
@Service
@Component
@ServerEndpoint(value = "/api/websocket/{sid}", encoders = {ServerEncoder.class})
public class WebSocketServer {

    /**
     * 静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
     */
    private static AtomicInteger onlineCount = new AtomicInteger();
    /**
     * concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
     */
    private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<>();

    /**
     * 与某个客户端的连接会话，需要通过它来给客户端发送数据
     */
    private Session session;

    /**
     * 接收sid
     */
    private String sid = "";

    /**
     * 连接建立成功调用的方法
     */
    @OnOpen
    public void onOpen(Session session, @PathParam("sid") String sid) {
        this.session = session;
        webSocketSet.add(this);
        this.sid = sid;
        addOnlineCount();
        try {
            sendMessage("conn_success");
            log.error("有新窗口开始监听:" + sid + ",当前在线人数为:" + getOnlineCount());
        } catch (Exception e) {
            log.error("websocket IO Exception");
        }
    }

    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        webSocketSet.remove(this);
        subOnlineCount();
        // 断开连接情况下，更新主板占用情况为释放
        log.info("释放的sid为：" + sid);
        // 这里写你 释放的时候，要处理的业务
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());

    }

    /**
     * 收到客户端消息后调用的方法
     *
     * @ Param message 客户端发送过来的消息
     */
    @OnMessage
    public void onMessage(String message, Session session) {
        log.info("收到来自窗口" + sid + "的信息:" + message);
        //群发消息
        for (WebSocketServer item : webSocketSet) {
            item.sendMessage(message);
        }
    }

    /**
     * @ Param session
     * @ Param error
     */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(String message) {
        try {
            this.session.getBasicRemote().sendText(message);
        } catch (IOException e) {
            log.error("消息发送异常: {}", e.getMessage());
        }
    }

    /**
     * 实现服务器主动推送
     */
    public void sendMessage(Object message) {
        try {
            this.session.getBasicRemote().sendObject(message);
        } catch (Exception e) {
            log.error("消息发送异常: {}", e.getMessage());
        }
    }

    /**
     * 群发自定义消息
     */
    public static void sendInfoBySid(Object message, String sid) {
        List<WebSocketServer> sidList = webSocketSet.stream().filter(item -> item.sid.equals(sid)).collect(Collectors.toList());
        sidList.forEach(webSocketServer -> webSocketServer.sendMessage(message));
    }

    public synchronized int getOnlineCount() {
        return onlineCount.get();
    }

    public synchronized void addOnlineCount() {
        WebSocketServer.onlineCount.incrementAndGet();
    }

    public synchronized void subOnlineCount() {
        WebSocketServer.onlineCount.decrementAndGet();
    }

    public CopyOnWriteArraySet<WebSocketServer> getWebSocketSet() {
        return webSocketSet;
    }

}
